aoqi@0: /*
aoqi@0:  * Copyright (c) 2002, 2011, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #ifndef SHARE_VM_RUNTIME_REGISTERMAP_HPP
aoqi@0: #define SHARE_VM_RUNTIME_REGISTERMAP_HPP
aoqi@0: 
aoqi@0: #include "code/vmreg.hpp"
aoqi@0: #include "utilities/globalDefinitions.hpp"
aoqi@0: #ifdef TARGET_ARCH_x86
aoqi@0: # include "register_x86.hpp"
aoqi@0: #endif
aoqi@0: #ifdef TARGET_ARCH_sparc
aoqi@0: # include "register_sparc.hpp"
aoqi@0: #endif
aoqi@0: #ifdef TARGET_ARCH_zero
aoqi@0: # include "register_zero.hpp"
aoqi@0: #endif
aoqi@0: #ifdef TARGET_ARCH_arm
aoqi@0: # include "register_arm.hpp"
aoqi@0: #endif
aoqi@0: #ifdef TARGET_ARCH_ppc
aoqi@0: # include "register_ppc.hpp"
aoqi@0: #endif
aoqi@0: 
aoqi@0: class JavaThread;
aoqi@0: 
aoqi@0: //
aoqi@0: // RegisterMap
aoqi@0: //
aoqi@0: // A companion structure used for stack traversal. The RegisterMap contains
aoqi@0: // misc. information needed in order to do correct stack traversal of stack
aoqi@0: // frames.  Hence, it must always be passed in as an argument to
aoqi@0: // frame::sender(RegisterMap*).
aoqi@0: //
aoqi@0: // In particular,
aoqi@0: //   1) It provides access to the thread for which the stack belongs.  The
aoqi@0: //      thread object is needed in order to get sender of a deoptimized frame.
aoqi@0: //
aoqi@0: //   2) It is used to pass information from a callee frame to its caller
aoqi@0: //      frame about how the frame should be traversed.  This is used to let
aoqi@0: //      the caller frame take care of calling oops-do of out-going
aoqi@0: //      arguments, when the callee frame is not instantiated yet.  This
aoqi@0: //      happens, e.g., when a compiled frame calls into
aoqi@0: //      resolve_virtual_call.  (Hence, it is critical that the same
aoqi@0: //      RegisterMap object is used for the entire stack walk.  Normally,
aoqi@0: //      this is hidden by using the StackFrameStream.)  This is used when
aoqi@0: //      doing follow_oops and oops_do.
aoqi@0: //
aoqi@0: //   3) The RegisterMap keeps track of the values of callee-saved registers
aoqi@0: //      from frame to frame (hence, the name).  For some stack traversal the
aoqi@0: //      values of the callee-saved registers does not matter, e.g., if you
aoqi@0: //      only need the static properies such as frame type, pc, and such.
aoqi@0: //      Updating of the RegisterMap can be turned off by instantiating the
aoqi@0: //      register map as: RegisterMap map(thread, false);
aoqi@0: 
aoqi@0: class RegisterMap : public StackObj {
aoqi@0:  public:
aoqi@0:     typedef julong LocationValidType;
aoqi@0:   enum {
aoqi@0:     reg_count = ConcreteRegisterImpl::number_of_registers,
aoqi@0:     location_valid_type_size = sizeof(LocationValidType)*8,
aoqi@0:     location_valid_size = (reg_count+location_valid_type_size-1)/location_valid_type_size
aoqi@0:   };
aoqi@0:  private:
aoqi@0:   intptr_t*    _location[reg_count];    // Location of registers (intptr_t* looks better than address in the debugger)
aoqi@0:   LocationValidType _location_valid[location_valid_size];
aoqi@0:   bool        _include_argument_oops;   // Should include argument_oop marked locations for compiler
aoqi@0:   JavaThread* _thread;                  // Reference to current thread
aoqi@0:   bool        _update_map;              // Tells if the register map need to be
aoqi@0:                                         // updated when traversing the stack
aoqi@0: 
aoqi@0: #ifdef ASSERT
aoqi@0:   void check_location_valid();
aoqi@0: #else
aoqi@0:   void check_location_valid() {}
aoqi@0: #endif
aoqi@0: 
aoqi@0:  public:
aoqi@0:   debug_only(intptr_t* _update_for_id;) // Assert that RegisterMap is not updated twice for same frame
aoqi@0:   RegisterMap(JavaThread *thread, bool update_map = true);
aoqi@0:   RegisterMap(const RegisterMap* map);
aoqi@0: 
aoqi@0:   address location(VMReg reg) const {
aoqi@0:     int index = reg->value() / location_valid_type_size;
aoqi@0:     assert(0 <= reg->value() && reg->value() < reg_count, "range check");
aoqi@0:     assert(0 <= index && index < location_valid_size, "range check");
aoqi@0:     if (_location_valid[index] & ((LocationValidType)1 << (reg->value() % location_valid_type_size))) {
aoqi@0:       return (address) _location[reg->value()];
aoqi@0:     } else {
aoqi@0:       return pd_location(reg);
aoqi@0:     }
aoqi@0:   }
aoqi@0: 
aoqi@0:   void set_location(VMReg reg, address loc) {
aoqi@0:     int index = reg->value() / location_valid_type_size;
aoqi@0:     assert(0 <= reg->value() && reg->value() < reg_count, "range check");
aoqi@0:     assert(0 <= index && index < location_valid_size, "range check");
aoqi@0:     assert(_update_map, "updating map that does not need updating");
aoqi@0:     _location[reg->value()] = (intptr_t*) loc;
aoqi@0:     _location_valid[index] |= ((LocationValidType)1 << (reg->value() % location_valid_type_size));
aoqi@0:     check_location_valid();
aoqi@0:   }
aoqi@0: 
aoqi@0:   // Called by an entry frame.
aoqi@0:   void clear();
aoqi@0: 
aoqi@0:   bool include_argument_oops() const      { return _include_argument_oops; }
aoqi@0:   void set_include_argument_oops(bool f)  { _include_argument_oops = f; }
aoqi@0: 
aoqi@0:   JavaThread *thread() const { return _thread; }
aoqi@0:   bool update_map()    const { return _update_map; }
aoqi@0: 
aoqi@0:   void print_on(outputStream* st) const;
aoqi@0:   void print() const;
aoqi@0: 
aoqi@0:   // the following contains the definition of pd_xxx methods
aoqi@0: #ifdef TARGET_ARCH_x86
aoqi@0: # include "registerMap_x86.hpp"
aoqi@0: #endif
aoqi@0: #ifdef TARGET_ARCH_sparc
aoqi@0: # include "registerMap_sparc.hpp"
aoqi@0: #endif
aoqi@0: #ifdef TARGET_ARCH_zero
aoqi@0: # include "registerMap_zero.hpp"
aoqi@0: #endif
aoqi@0: #ifdef TARGET_ARCH_arm
aoqi@0: # include "registerMap_arm.hpp"
aoqi@0: #endif
aoqi@0: #ifdef TARGET_ARCH_ppc
aoqi@0: # include "registerMap_ppc.hpp"
aoqi@0: #endif
aoqi@0: 
aoqi@0: };
aoqi@0: 
aoqi@0: #endif // SHARE_VM_RUNTIME_REGISTERMAP_HPP